import java.util.Scanner;

public class HelloWorldProblem {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        String str = "Hello World";
        str = str.replace('1', (char) ('0' + n));
        System.out.println(str);
        scanner.close();
    }
}